Answer
$n=2$
Work Step by Step
$\dot{Q}_c=8.4\ kW\times0.4=3.36\ kW$
$\dot{Q}_p=7\times100W=0.7\ kW$
$\dot{Q}=4.06\ kW=13853\ Btu/h$
$n=\dot{Q}/\dot{Q}_u,\ \dot{Q}_u=7000\ Btu/h$
$n=1.98\rightarrow n=2$
Thermodynamics: An Engineering Approach 8th Edition
by Cengel, Yunus; Boles, Michael
Published by
McGraw-Hill Education
ISBN 10:
0-07339-817-9
ISBN 13:
978-0-07339-817-4
Chapter 6 - The Second Law of Thermodynamics - Problems - Page 315: 6-53E
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